<template>
	<!-- v-if判断goods_info.goods_name是否存在后显示全部页面，解决商品详情请求回来之前，data中goods_info的值为{}导致初次渲染时导致商品价格、商品名称等闪烁为undefine的问题 -->
	<view v-if="goods_info.goods_name">
		<!-- 轮播图位置 -->
		<swiper :indicator-dots="true" :autoplay="true" :interval="3000" :duration="1000" :circular="false">
			<swiper-item v-for="(item,i) in goods_info.pics" :key="i">
				<image :src="item.pics_big" @click="preview(i)"></image>
			</swiper-item>
		</swiper>

		<!-- 商品信息区域 -->
		<view class="goods-info-box">
			<!-- 商品价格 -->
			<view class="price">
				￥{{goods_info.goods_price}}
			</view>
			<!-- 信息主体区域 -->
			<view class="goods-info-body">
				<!-- 商品名称 -->
				<view class="goods-name">
					{{goods_info.goods_name}}
				</view>
				<!-- 收藏 -->
				<view class="favi">
					<uni-icons type="star" size="18" color="gray"></uni-icons>
					<text>收藏</text>
				</view>
			</view>
			<!-- 运费 -->
			<view class="yf">
				快递，免运费
			</view>
		</view>

		<rich-text :nodes="goods_info.goods_introduce"></rich-text>

		<!-- 商品导航组件 -->
		<view class="goods_nav">
			<!-- fill控制右侧按钮的样式 -->
			<!-- options左侧按钮的配置项 -->
			<!-- buttonGroup右侧按钮的配置项 -->
			<!-- click左侧按钮的点击事件处理函数 -->
			<!-- buttonClick右侧按钮的点击事件处理函数 -->
			<uni-goods-nav :fill="true" :options="options" :buttonGroup="buttonGroup" @click="onClick"
				@buttonClick="buttonClick"></uni-goods-nav>
		</view>
	</view>
</template>

<script>
	import {
		mapState,
		mapMutations,
		mapGetters
	} from 'vuex'
	export default {
		computed: {
			...mapState('m_cart', ['']),
			...mapGetters('m_cart', ['total'])
		},
		//侦听器，监听购物车添加数量的数值
		watch: {
			//定义total侦听器，指向一个配置对象
			// 以下侦听器使用普通函数的形式定义，但在首次页面加载时不会被调用，导致首次加载后不会将商品总数显示到商品导航区域
			// total(newVal) {
			// 	const findResult = this.options.find(x => x.text === '购物车')
			// 	if(findResult){
			// 		findResult.info = newVal
			// 	}
			// }
			
			//以下为重新以对象的形式进行定义侦听器
			total:{
				//handler属性用来定义侦听器的function处理函数
				handler(newVal){
					const findResult =this.options.find(x => x.text === '购物车')
					if(findResult){
						findResult.info = newVal
					}
				},
				//immediate属性用来声明此侦听器，是否在页面初次加载完毕后能够立即调用
				immediate:true
			}
		},
		data() {
			return {
				//商品详情对象
				goods_info: {},

				//下端左侧按钮组的配置对象
				options: [{
					icon: 'shop',
					text: '店铺',
					infoBackgroundColor: '#007aff',
					infoColor: "red"
				}, {
					icon: 'cart',
					text: '购物车',
					info: 0
				}],

				//下端右侧按钮组的配置对象
				buttonGroup: [{
						text: '加入购物车',
						backgroundColor: '#ff0000',
						color: '#fff'
					},
					{
						text: '立即购买',
						backgroundColor: '#ffa200',
						color: '#fff'
					}
				]
			};
		},
		onLoad(options) {
			//获取商品ID
			const goods_id = options.goods_id
			//调用请求商品详情数据的方法
			this.getGoodsDetail(goods_id)
		},
		methods: {
			...mapMutations('m_cart', ['addToCart']),
			async getGoodsDetail(goods_id) {
				const {
					data: res
				} = await uni.$http.get('/api/public/v1/goods/detail', {
					goods_id
				})
				if (res.meta.status !== 200) return uni.$showMsg()

				//使用字符串的replace()方法，为img标签添加行内的style样式，从而解决图片底部空白间隙的问题;
				//同时以上述方法将添加图片后缀为jpg以图片在手机上能正常显示
				res.message.goods_introduce = res.message.goods_introduce.replace(/<img/g,
					'<img style="display:block;"').replace(/webp/g, 'jpg')

				this.goods_info = res.message
			},
			//实现轮播图的预览效果
			preview(i) {
				//调用
				uni.previewImage({
					//预览时默认显示图片的索引
					current: i,
					//所有图片url地址的数组
					urls: this.goods_info.pics.map(x => x.pics_big)
				})
			},
			onClick(e) {
				// console.log(e)
				if (e.content.text === '购物车') {
					uni.switchTab({
						url: '/pages/cart/cart'
					})
				}
			},
			buttonClick(e) {
				// console.log(e)
				if (e.content.text === '加入购物车') {
					//组织商品的信息对象
					//{goods_id,goods_name,goods_price,goods_count,goods_small_loge,goods_state}
					const goods = {
						goods_id: this.goods_info.goods_id,
						goods_name: this.goods_info.goods_name,
						goods_price: this.goods_info.goods_price,
						goods_count: 1,
						goods_samll_logo: this.goods_info.goods_small_logo,
						goods_state: true
					}

					//调用addToCart方法
					this.addToCart(goods)
				}
			}
		}
	}
</script>

<style lang="scss">
	swiper {
		height: 750rpx;

		image {
			width: 100%;
			height: 100%;
		}
	}

	//商品信息区域的样式
	.goods-info-box {
		padding: 10px;
		padding-right: 0;

		.price {
			color: #C00000;
			font-size: 18px;
			margin: 10px 0;
		}

		.goods-info-body {
			display: flex;
			justify-content: space-between;

			.goods-name {
				font-size: 13px;
				margin-right: 10px;
			}

			.favi {
				width: 120px;
				font-size: 12px;
				display: flex;
				flex-direction: column;
				align-items: center;
				justify-content: center;
				border-left: 1px solid #efefef;
				color: gray;
			}
		}

		.yf {
			font-size: 12px;
			color: gray;
			margin: 10px 0;
		}
	}

	.goods_nav {
		position: fixed;
		bottom: 0;
		left: 0;
		width: 100%;
	}

	.goods-detail-container {
		//给页面外的容器，添加50px的内padding
		//防止页面内容被底部的商品导航组件遮盖
		padding-bottom: 50px;

	}
</style>
